Ozone-Depleting Chemicals Are Most Efficient at the Poles, Both for Arctic

Multiple Choice

Ozone-depleting chemicals are most efficient at the poles, both for Arctic and Antarctic regions. The major reason for this is:

A) lots of CFCs are used in polar regions.
B) tourists there pollute the atmosphere.
C) very cold winters.
D) all the ozone is formed over the equator and none reaches the poles.
E) a lack of stringent air pollution laws at the poles.